US523671A - Packing for piston-rods - Google Patents

Description

(NoModel.)

E. P. LEWIS.

i PACKING PoR- PlsToN Runs. i l No. 523,671. Patented July 31, 1894.

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'UNITED STATES PATENT EEICE.k

l EUGENE E. LEWIS, on NoEwIcII, CONNECTICUT.y

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SPEGIFICATIN forming part of Letters Patent No. 523,671, dated July 3] 1.894'.

` Application filed October 30, 1893. Serial No. 489,526, (llo model.)

To all whom it may concern,.-

:Be it known that I, EUGENE F. LEwIs,a citizen of the United States, residing at Norwich, in the county of New London and State of Connecticut, have invented certain new v and useful Improvements in Packing for Piston-Rods, which improvements are fully set forth and described in the following specilication, reference being had to the accompato nying sheet of drawings.

My present invention seeks particularly to provide an improved form of ring-packing for use with piston packingsof the class patented to Frank T. Whaley and myself January 6, 1891, No. 444,002, to the end that more perfect and reliable steam joints may be made and that the ring segments may wear down thinner than heretofore and continue serviceable. I have also provided, for use withmy improved zo packing,a simple device for wedging and locking piston-rods Within the cylinder-head; to be brought into service intimes of accident, as hereinafter fully explained.

Figure 1, of the annexed drawings, is a side 2 5 elevation of a portion of a cylinder-head, having an extended boss which forms the houslng of my packing and also shows a portion of the piston-r0d seated therein. Fig. 2 is a central, longitudinal, sectional, View of the 3o same parts. Fig.'3 is a detached, end, View of the sectional ring-packing and `its compressing spring, the latter being shown de V'cached in Fig. 6. Fig. 4 `illustrates side and end vlews of a washer against which the rear 3 5 end of the ring-packing abuts when the'several parts are assembled for use and Fig. 5 is a detached View of one section of the packing proper, illustrating the Amanner in which said packing is bent and opened to slip itover the 4o piston-rod.

In Figs. 1 and 2 the letter a denotes a portion of a cylinder-head, having its boss b bored to receive the piston-rod c and counterbored to receive the ring packing and its supports. The packing proper is formed of two rings d d', of soft metal, each having several circumferential V shaped grooves d2 one only of which iscut entirely through said rino. When itis desired to assemble the various parts the 5o rings d d may be readily bent and opened (see Fig. 5) until they may be slipped overthe piston-rod. They are then -bent 'back into their original form and are placedfend'to end, with the V shaped grooves offsetvfrom each other, to break joints, a dow'el pinye being 55 y used, preferably, to prevent any subsequent displacement of the rings relatively to each other. Around the rings ol CZ is then placed `an open spring f which is thickest opposite itsvopen side and is of a width equalto, or 6o slightly greater than, the combined thickness of the two abutting rings d d. In the rear of the described ring-packing is a washer g whose central opening is consider'- ably larger than the piston rod. This washer is shouldered, and extended at its rear end, as

at g. and around this'extension is coiled a spring h one of whose ends abuts the bottom of the counterbore in boss b. Springh seeks constantly t expand and thus forces the 7o washerg int close engagement with the ring 'd and the rear edge of the compression spring f, insuring at all times a stem-tightjoint at the rear of the ringpacking.

Immediately at the front ofthe ring d is a I gland i', of ordinary form, that is held in place by a plate 7c which is clamped to the boss b by screws or bolts 7c. A ring m, of soft metal, v as copper, may be inserted between the outer end of boss b and the inner face of gland i 8o which, asl the gland is forced home, will be iiattened and insure a tight joint. It should be noted that the compression spring f is firmly clamped between the gland .and the washer g and that't-he opening of said spring 85 breaks joints with the V shaped cuts of bothk rings d d so that no steam can escapebetween the packing and the gland. A dowel-pin f may be provided to prevent slippingof spring f on the sectional rings. .9o

I will now describe a simple device for locking the piston-rod within theY cylinder-head, asking reference to Figs. 1 and 2 of the drawings. It .often occurs, with locomotive engines, that one side of the driving mechanism becomes disabled through accidentand such engines are' run, for a time, by the driving.. mechanism of one side only and it is desirable then that the piston and valve mechanism of the disabled side shall be so locked that they Ioo will notl jar loose and move about aimlessly and, to accomplish this desirable result, I have provided a lock, of wedge form, as seen at ai, having an angle plate n that may be fastened by a simple screw n2 to the plate la. When not in use this locking piece is clamped to the outer face of plate k, with its wedge n eX- tending outward, as in Fig. l, but whenever it is desired to utilize said piece, to lock the piston-rod against displacement, screw n2 is removed and the end of the wedge is reversed and forced between the piston-rod and the Wall of the opening in plate 7c, as seen in Fig. 2. Screw n2 is then inserted and screwed home, `forcing the wedge before it and thus firmly clamping the piston-rod against end- Wisemovement. rThe wedge piece adds practically nothing to the cost of an engine, is always within convenient reach when needed 2o `and is quite as eective as expensive dogs or clamps nowcornmonly used for the same purose. i g p Having described my invention, I claim- The herein-described packing for piston rods, consisting of two rings, each having circumferential grooves and so arranged relatively to each other that the grooves of each will be opposite the solid parts ofthe other, a spring encircling said rings, a spring-pressed Washer at one side of the rings, a gland at the otherside of said rings, designed to be clamped to the boss of the cylinder head, and a compressible ring designed to be located between the inner face of said gland and said boss,sub stantially as described and for the purposes specified.

`Witnesses: p

FRANK H. ALLEN, ALONZO M. LUTHER.

EUGENE F. LEWIS;`

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